Use-After-Free Detection

detecting-use-after-free

Detects use-after-free vulnerabilities by identifying pointer dereferences after memory deallocation. Use when analyzing memory management, cleanup code, or investigating dangling pointer issues.

majiayu000/claude-skill-registry·0installs663starsSecurity

SKILL.md

Full skill instructions

Use-After-Free Detection

Detection Workflow

Identify free operations: Find all free(), realloc(), delete calls and note the pointer being freed
Trace pointer usage: Use xrefs_to to find all dereferences of the pointer
Check control flow: Analyze paths through code to identify usage after free
Assess exploitability: Can attacker control freed memory? Is there a useful use-after-free? Can memory be reallocated?

Key Patterns

Pointer dereference after free()
Double free vulnerabilities
Invalid pointer access after realloc()
Reference counting issues

Output Format

Report with: id, type, subtype, severity, confidence, location, freed pointer, free operation, use operation, use-after-free status, distance, exploitability, attack scenario, impact, mitigation.

Severity Guidelines

CRITICAL: Use-after-free with code execution
HIGH: Use-after-free with data corruption
MEDIUM: Use-after-free causing crashes
LOW: Use-after-free with limited impact

Install skill

Copy and run in your terminal

npx -y skills add https://github.com/majiayu000/claude-skill-registry --skill detecting-use-after-free

View on GitHub

skills/data/detecting-use-after-free/SKILL.md

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